Conditions and access
Columbia's clay-and-sandhills soil transition, mature pine cover, and a mix of historic in-town lots and newer suburban parcels all affect access and grading time.
Scope and materials
The proposal should spell out footing spec, joist layout, decking and hardware grade, and disposal of any removed material — not leave it assumed.
Permits and specialist input
Historic-preservation review and the city's stormwater program can both apply depending on the parcel; confirm with the city and your provider before scope is finalized.
Educational planning only
Nothing here is a quote — it's planning information. A real number needs someone to see the actual yard.